How can CNG be a better alternative to petrol?

Explanation

### Step-by-Step Solution:

1. **Definition of CNG**:
- CNG stands for Compressed Natural Gas, which primarily consists of methane (CH₄).

2. **Production Process**:
- CNG is produced anaerobically, which means it is generated in the absence of oxygen. This process occurs naturally over time from organic materials.
- In contrast, petrol is derived from fossil fuels, which take millions of years to form from the remains of dead plants and animals under high temperature and pressure.
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